Hi Chris
The correct setting for your display is OLED type 3.
The scrolling issue has previously been reported, and I included a fix to mpd_oled for it last year. The issue thread is Display flicker and frame size issue · Issue #3 · antiprism/mpd_oled · GitHub
Have you downloaded and installed mpd_oled using the mpd_oled repository? GitHub - antiprism/mpd_oled: MPD, Volumio, RuneAudio and Moode OLED status and spectrum display for Raspberry Pi (and similar)
Do you ever see the display scroll offset resetting (so that the display image jumps to the correct position)?
Adrian.